    //
//  CustomOperationDemoViewController.m
//  ConcurrencyStudy
//
//  Created by longhuihu on 11-6-28.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "CustomOperationDemoViewController.h"

@interface MyOperation : NSOperation
{
	NSString *_name;
	CustomOperationDemoViewController * _controller;
}
@property(nonatomic,copy) NSString* name;
@property(nonatomic,assign) CustomOperationDemoViewController* controller;

-(id)initWithName:(NSString*)name andController:(CustomOperationDemoViewController*)controller;
@end

@implementation MyOperation

@synthesize name=_name;
@synthesize controller=_controller;


-(id)initWithName:(NSString*)name andController:(CustomOperationDemoViewController*)controller
{
	if (self=[super init]) {
		self.name = name;
		self.controller = controller;
	}
	return self;
}

-(void)dealloc
{
	[self.name release];
	[super dealloc];
}

-(void)main
{
	[UIApplication sharedApplication].networkActivityIndicatorVisible=YES;
	for (int i=0; i<5; i++) {
		[NSThread sleepForTimeInterval:1.0];
		if ([self isCancelled]) {
			[self.controller showLog:[NSString stringWithFormat:@"%@ cancelled",self.name]];
			break;
		} else {
			[self.controller showLog:[NSString stringWithFormat:@"%@ step %d",self.name,i]];
		}
	}	
	[UIApplication sharedApplication].networkActivityIndicatorVisible=NO;
}
@end




@implementation CustomOperationDemoViewController

@synthesize operation = _operation;

// The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization.
    }
    return self;
}
*/

/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
}
*/

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

-(void)startOperation
{
	static NSInteger operationIndex = 1;
	if (self.operation!=nil) {
		[self.operation cancel];
		self.operation = nil;
	}
	
	[self showLog:@"prepare operation"];
	
	self.operation = [[[MyOperation alloc] initWithName:[NSString stringWithFormat:@"Operation%d",operationIndex] 
										  andController:self] 
					  autorelease];
	[self.operation addObserver:self forKeyPath:@"isFinished" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isCancelled" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isExecuting" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isFinished" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.operation addObserver:self forKeyPath:@"isReady" options:NSKeyValueObservingOptionNew context:self.operation];
	[self.queue addOperation:self.operation];
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc. that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}


@end
